ncpp does not respect MacPorts compiler settings

[barracuda156]

​https://github.com/NCAR/ncpp/issues/2

Build fails:

--->  Building ncpp
Executing:  cd "/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_ncpp/ncpp/work/ncpp-2.3.0" && /opt/local/bin/scons OPT_PREFIX=/opt/local 
scons: Reading SConscript files ...
Loading eol_scons from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_ncpp/ncpp/work/ncpp-2.3.0/site_scons/eol_scons...
Searching for tool_*.py files...
Found 1 tool files, caching is disabled.
Config files: ['/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_ncpp/ncpp/work/ncpp-2.3.0/config.py']
Checking for netcdf linking...yes
scons: done reading SConscript files.
scons: Building targets ...
g++ -o raf/ACconfig.o -c -g -Wall -std=c++11 -Wno-write-strings -Wno-deprecated-register -g -Wall -Wno-write-strings -DPNG -I. -I/opt/local/include raf/ACconfig.cc
cc1plus: error: unrecognized command line option "-Wno-deprecated-register"
cc1plus: error: unrecognized command line option "-std=c++11"
scons: *** [raf/ACconfig.o] Error 1
scons: building terminated because of errors.

It also fails if I set compiler.cxx_standard 2011, because it just ignores compiler settings.